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Question

Which one of the following generally act as an antagonist to gibberellins?
  1. Zeatin
  2. Ethylene
  3. ABA
  4. IAA


Solution

The correct option is C ABA
Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller, stem elongation, germination, flowering. It also helps in opening of stomata and promote development of fruits.

Abscisic Acid (ABA) is also called stress hormone. It functions as growth inhibitor.  It causes stomatal closure, abscission of flower and fruits.

Therefore, ABA act as an antagonists to gibberellins.

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